Looking at weather data from the Columbia Regional Airport for the past 30 years, the average high temperature for the start of May is 71 degrees but climbs to 79 by the 31st while the average low temperature rises from 49 at the start of the month to 59 on the 31st.
The highest temperature in May since records began in 1890 is 101 in 1934 and the lowest is 28 from back in 1907. The warmest May on record was in 1962 and the coldest May on record in Mid-Missouri occurred back in 1924.
May is normally a rainy month with the average rainfall of 4.98 inches. The most rainfall in May came in at 13.30 inches in 1943 and the driest May with only .35 inches of rain occurred in 1901.
Daylight continues to increase and we will gain 52 minutes of daylight with sunset at 8:01 p.m. on the 1st and at 8:28 on the 31st.